STIGQter: STIG Summary: Juniper EX Series Switches Router Security Technical Implementation Guide Version: 2 Release: 1 Benchmark Date: 24 Jul 2024:

The Juniper BGP router must be configured to reject route advertisements from BGP peers that do not list their autonomous system (AS) number as the first AS in the AS_PATH attribute.

DISA Rule

SV-253978r945854_rule

Vulnerability Number

V-253978

Group Title

SRG-NET-000018-RTR-000006

Rule Version

JUEX-RT-000060

Severity

CAT III

CCI(s)

• CCI-000032 - Enforce information flow control using organization-defined security policy filters as a basis for flow control decisions for organization-defined information flows.

Weight

10

Fix Recommendation

Configure all ASBRs to deny updates received from eBGP peers that do not list their AS number as the first AS in the AS_PATH attribute.

set protocols bgp group eBGP enforce-first-as
set protocols bgp group eBGP neighbor <address>
set protocols bgp enforce-first-as

Check Contents

Review the BGP router configuration to verify the router is configured to deny updates received from eBGP peers that do not list their AS number as the first AS in the AS_PATH attribute.

Verify the configuration of "enforce-first-as" at either the BGP global or group level.
[edit protocols bgp]
group eBGP {
enforce-first-as;
neighbor <address>;
}
enforce-first-as;

If the router is not configured to reject updates from peers that do not list their AS number as the first AS in the AS_PATH attribute, this is a finding.

Vulnerability Number

V-253978

Documentable

False

Rule Version

JUEX-RT-000060

Severity Override Guidance

Review the BGP router configuration to verify the router is configured to deny updates received from eBGP peers that do not list their AS number as the first AS in the AS_PATH attribute.

Verify the configuration of "enforce-first-as" at either the BGP global or group level.
[edit protocols bgp]
group eBGP {
enforce-first-as;
neighbor <address>;
}
enforce-first-as;

If the router is not configured to reject updates from peers that do not list their AS number as the first AS in the AS_PATH attribute, this is a finding.

Check Content Reference

M

Target Key

5479